[Haskell-cafe] Relaxing atomicity of STM transactions

bieniusa bieniusa at informatik.uni-freiburg.de
Tue Sep 28 09:53:48 EDT 2010

Hi Tom,

you can do this with Twilight STM. I recently uploaded the first version
on hackage[1].
The next version including a better algorithm and examples is about to
be released in a few days.

Twilight STM features include tagging of variables and fine-grained
conflict detection, flexible isolation level semantics (snapshot
isolation and opacity) as well as safe integration of I/O.

- Annette

[1] http://hackage.haskell.org/package/twilight-stm
Am 28.09.2010 15:35, schrieb Tom Hawkins:
> Has anyone in the STM community considered the ability to read a TVar,
> such that it would allow the transaction to complete even if the TVar
> was modified by another transaction?  (I am assuming this is not how
> STM works by default.)  For example:
> looselyReadTVar :: TVar a -> STM a
> Atom [1] has similar semantics to STM.  If Atom were to relax it's
> rule atomicity in this fashion, it could open the door to improved
> task scheduling and higher levels of program description.  Has STM
> research already gone down this path?
> -Tom
> [1] http://hackage.haskell.org/package/atom
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